 Opononi - (New Zealand) |
| Opp - (Alabama, United States) |
| Oppdal - (Norway) |
| Oppenheim - (Germany) |
| Oquossoc - (Maine, United States) |
| Oracle - (Arizona, United States) |
| Oradell - (New Jersey, United States) |
| Oradour-sur-Vayres - (France) |
| Orange - (California, United States) |
| Orange - (France) |
| Orange - (Virginia, United States) |
| Orange - (Texas, United States) |
| Orange - (New South Wales, Australia) |
| Orange - (Connecticut, United States) |
| Orange Beach - (Alabama, United States) |
| Orange City - (Florida, United States) |
| Orange City - (Iowa, United States) |
| Orange Creek - (Bahamas) |
| Orange Park - (Florida, United States) |
| Orangeburg - (South Carolina, United States) |
| Orangeburg - (New York, United States) |
| Orangeville - (Ontario, Canada) |
| Oranjestad - (Aruba) |
| Oranjestad - (St Eustatius) |
| Oranjestad - (United Kingdom) |
| Oranjewoud - (Netherlands) |
| Orbost - (Victoria, Australia) |
| Orcas - (Washington, United States) |
| Ord - (Nebraska, United States) |
| Ordino - (Andorra) |
| Orebro - (Sweden) |
| Oregon - (Ohio, United States) |
| Oregon City - (Oregon, United States) |
| Orem - (Utah, United States) |
| Orense - (Spain) |
| Orford - (Quebec, Canada) |
| Orgeval - (France) |
| Oria-Valsolda - (Italy) |
| Orient Bay - (St. Martin/Maarten) |
| Orient Beach - (US Virgin Islands) |
| Orient Beach - (Netherlands Antilles) |
| Oriental - (North Carolina, United States) |
| Orihuela - (Spain) |
| Orillia - (Ontario, Canada) |
| Oriskany - (New York, United States) |
| Oristano - (Sardinia Is, Italy) |
| Orizaba - (Veracruz, Mexico) |
| Orkanger - (Norway) |
| Orland - (California, United States) |
| Orland - (Maine, United States) |
| Orland Park - (Illinois, United States) |
| Orlando - (Florida, United States) |
| Orleans - (Massachusetts, United States) |
| Orleans - (France) |
| Orly - (France) |
| Ormond Beach - (Florida, United States) |
| Ormonde - (South Africa) |
| Ornskoldsvik - (Sweden) |
| Oroklini - (Cyprus) |
| Orondo - (Washington, United States) |
| Orono - (Maine, United States) |
| Oropesa Del Mar - (Spain) |
| Orosi - (Costa Rica) |
| Oroville - (California, United States) |
| Oroville - (Washington, United States) |
| Orpheus Island - (Queensland, Australia) |
| Orpington - (United Kingdom) |
| Orrtanna - (Pennsylvania, United States) |
| Orsova - (Romania) |
| Orsta - (Norway) |
| Orta San Giulio - (Italy) |
| Ortaca - (Turkey) |
| Orthez - (France) |
| Ortisei - (Italy) |
| Ortonville - (Minnesota, United States) |
| Orvieto Scalo - (Italy) |
| Orwell - (Vermont, United States) |
| Os - (Norway) |
| Osage - (Iowa, United States) |
| Osage Beach - (Missouri, United States) |
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